Original question concerned why the KZPAC-xx were not supported with
18 Gig drives (
http://www.digital.com/info/SOC/) and whether there
was a known difference between them and KZPSC which I have been using
with 18 Gig Seagates with no apparent ill effects (yet). (I did not
care about the 32 gig limit.)
Thanks to:
alan_at_nabeth.cxo.dec.com
Keith Piepho <kap_at_uakron.edu>
Sean McGlynn <sean_at_mcglynnuk.freeserve.co.uk>
Bryan Lavelle <Bryan.Lavelle_at_digital.com>
Probaby work ok:
Nobody said there was any positive reason that the configuration
was not supported, only that the conditions were not tested to
provide support. Like many other configurations with non-DEC
components that cannot be supported, it still may work fine.
You're on your own (yoyo). No differences between the KZPSC
and KZPAC were mentioned other than support (see below).
Performance:
Keith said he had heard that the lack of support was performance
related. Nobody provided any evidence of this, but is is consistent
with some of my own observations of KZPSCs. Here are some impressions
without much numeric documentation (sorry). These drives
are being used for storage of files served by SAMBA and are not
heavily loaded, so the user-level performance has not been much
of an issue.
a. Two 18 Gig drives mirrored:
Seemed ok. Noticed no major ill effects.
b. Five 18 Gig drives in RAID 5:
"newfs" was _extremely_ slow. It was very noticeable
and I was concerned about using it. In practice it
has not been a problem. One example of coping a 67 Meg file
(67939752) did not have any real surprises:
/bin/time cp xx.avi jnk
real 16.8
user 0.0
sys 2.6
/bin/time cp xx.avi jnk [second time faster, of course]
real 8.1
user 0.0
sys 2.4
KZPSCs and TU 5.x
Sean mentioned something I hadn't noticed -- the KZPSCs will
not be supported in Version 5:
http://www.digital.com/info/CUA007/CUA007HM.HTM
---------------------------------------------------------------------------
Michael A. Crowley Director of Networking
mcrowley_at_mtholyoke.edu 216 Dwight Hall, Mount Holyoke College
413-538-2140 South Hadley, MA 01075-6415
fax: 413-538-2331
http://www.mtholyoke.edu/~mcrowley
---------------------------------------------------------------------------
Received on Sat May 08 1999 - 16:04:55 NZST